JP6547470B2 - Parent station communication device, optical communication network system, and communication system - Google Patents

Description

  The present invention relates to a master station communication apparatus, an optical communication network system, and a communication system, and is applied to, for example, a network in a wired section on the upper side (core side) from a base station connected to a wireless communication terminal (for example, a mobile phone terminal). It can.

  A communication system called C-RAN (Centralized Radio Access Network) is known as a base station facility (a communication facility on the communication carrier side) for connecting to a conventional digital wireless communication terminal such as a mobile phone.

  In C-RAN, a base station function is separated into a BBU (Base Band Unit) that performs radio signal processing, and a plurality of RRHs (Remote Radio Heads) that are antenna portions, and both are usually directly connected by an optical fiber . Moreover, in C-RAN, it is set as the structure which accommodates several RRH in one BBU. With such a configuration, in C-RAN, only a large-sized and heavy BBU is installed in a telecommunications carrier's building (for example, in a central office of a central office), and the antenna part is relatively light in weight. (RRH) can be installed outdoors (for example, on a telephone pole or the rooftop of a condominium, etc.). Since the weight and space of installable devices are limited due to the structure of the utility pole and the apartment, it is desirable that the devices installed outdoors be smaller and lighter.

  Moreover, in the conventional C-RAN, a technique called COMP (Coordinated Multi-point) is applied to reduce interference noise by coordinating between adjacent cells or terminals. In C-RAN, CoS (Coordinated Scheduling) technology is particularly relevant. In C-RAN, for example, focusing on the fact that the transmission power of the RRH is much larger than the transmission power of the terminal, CoS is performed by means such that adjacent RRHs stop transmission while the terminal is transmitting to the RRH to be communicated. (COMP) is realized.

  Furthermore, in the conventional C-RAN, application of a PON (Passive Opticai Network), which is a star network, to communication between the BBU and the RRH is being considered. The PON is a form of access network using optical fibers, and by using splitters, 1: N multi-branch optical fiber and time division demultiplexing, wavelength demultiplexing technology, etc. : ONU is configured to be accommodated by one optical line terminal (OLT).

  Conventionally, the connection means for connecting the RRH and the BBU in the C-RAN is usually a dedicated line (a dedicated optical fiber for each RRH), but by applying the PON, the station-side termination device It is possible to reduce the number of optical fibers and the distance between them and the joining side termination device. Conventionally, as a technology in which PON is applied to C-RAN, for example, there is a technology described in Patent Document 1.

  In the technology described in Patent Document 1, each BBU-RRH section is configured by PON. That is, in the technology described in Patent Document 1, the OLT of PON is connected to BBU, and the ONU of PON is connected to each RRH. Therefore, in the technology described in Patent Document 1, the BBU, the OLT, the ONU, the RRH, and the user terminal (hereinafter, also referred to as “User Equipment” and “UE”) are connected in order from the upstream side.

  However, when connecting between RRH and BBU by PON, there are two problems. The first problem is that CPRI (Common Public Radio Interface), which is a signal format for connecting RRHs and BBUs in C-RAN, is a digital signal, but it is close to a signal that only analog-to-digital converts an analog signal, Since it is not packet-based (not encoded), PON can not be transmitted as it is. As a second problem, the bandwidth for transmitting CPRI is required to be about 10 times the amount of information that is substantially necessary It is a point.

  Conventionally, as a method for solving the first problem described above, transmission and reception of packets in a fixed cycle between the OLT and each ONU is performed to provide a transmission line of a fixed band substantially like a dedicated line. There is a way. Also, conventionally, as a solution to the above-mentioned second problem, there is a method in which a CPRI signal is losslessly compressed (coded), inserted into a packet such as Ethernet (registered trademark), and a PON section is transmitted. (See Patent Document 1). Furthermore, conventionally, as a solution to the above-mentioned second problem, a method of performing more efficient data transmission by changing the amount and timing of packets transmitted and received by PON according to communication traffic between RRH and BBU. (See Patent Document 1).

JP, 2014-103501, A

  However, in the communication system in which the conventional RRH and BBU are connected by PON, communication control in the PON section (communication control between ONU and OLT every time uplink signal is transmitted from RRH (UE) to BBU) ) Occurs. For example, in a communication system in which a conventional RRH and a BBU are connected by PON, when transmitting an uplink signal from the RRH (UE) to the BBU, the traffic amount to be transmitted from the RRH-side ONU is reported to the OLT as a REPORT signal. As a result, a delay corresponding to the notification of the transmittable time from the OLT to the ONU by the GRANT signal (GATE signal) occurs. That is, in the communication system in which the conventional RRH and BBU are connected by PON, in addition to the communication control between BBU and RRH, since communication control in the PON section occurs, comparison with the case where PON is not used Communication delay and throughput are likely to occur.

  In addition, when transmitting and receiving packets of packets used for communication between the OLT and each ONU with a fixed cycle, the ONU will always be fixed if a transmission line of a fixed band such as a dedicated line is substantially provided. Since transmission and reception of control signals for securing a band are performed in a short cycle, it becomes difficult to extend the sleep time. As a result, in the ONU, the power saving control becomes disadvantageous by securing the sleep time. In general, power saving is more effective if continuous transmission and continuous pause are performed in a long cycle.

  In view of the above problems, a signal performing transmission / reception processing of a signal with a wireless communication terminal via a wireless antenna device (for example, RRH) having a wireless antenna for transmitting / receiving a wireless signal to / from a wireless communication terminal When connecting with a processing unit (for example, BBU) by PON, a master station communication unit (for example, OLT), an optical communication network system (for example, PON), and communication that enable high-speed and efficient communication A system is desired.

  According to a first aspect of the present invention, between a plurality of wireless antenna devices having a wireless antenna transmitting and receiving a wireless signal to and from a wireless communication terminal, and a signal processing device performing transmission and reception processing of signals with the wireless communication terminal via the wireless antenna device. The master station communication apparatus constituting the optical communication network system for performing data transmission of (1) is connected with the slave station communication apparatus connected to each of the wireless antenna apparatuses by PON and supplied from the signal processing apparatus A process of processing data and transmitting it as a downlink signal to the slave station communication device, and processing an uplink signal received from each slave station communication device and transmitting the signal to the signal processing device; A data transmission / reception processing unit which permits uplink signal transmission to the slave station communication apparatus when receiving an uplink signal from the station communication apparatus; (2) the data transmission / reception process The communication control signal to the wireless communication terminal is extracted with reference to the downlink signal processed by the unit, and the upstream signal transmitted from the wireless communication terminal is predicted based on the extracted communication control signal, and Based on the result, the transmission / reception processing unit is controlled to permit the slave station communication device corresponding to the slave station wireless antenna device connected to the wireless communication terminal to transmit an uplink signal based on the result of the prediction. And band control processing means for transmitting data.

  According to a second aspect of the present invention, between a plurality of wireless antenna devices having a wireless antenna transmitting and receiving a wireless signal to and from a wireless communication terminal, and a signal processing device performing transmission and reception processing of signals with the wireless communication terminal via the wireless antenna device. In the optical communication network system in which the PONs are connected by PON, a master station communication which is connected to the slave station communication device connected to each of the wireless antenna devices and the signal processing device and is connected to each slave station communication device by PON An optical communication network system comprising: a device; and the master station communication device according to the first aspect of the present invention applied as the master station communication device.

  According to a third aspect of the present invention, there is provided a wireless communication terminal, a plurality of wireless antenna devices having a wireless antenna for transmitting and receiving a wireless signal to and from the wireless communication terminal, and a process of transmitting and receiving signals with the wireless communication terminal via the wireless antenna device. In a communication system comprising a signal processing device for performing the above-mentioned operations and an optical communication network system for connecting between the respective wireless antenna devices and the master station communication devices by PON, the optical system according to the second invention of the present invention as the optical communication network system A communication system characterized in that a communication network system is applied.

  According to the present invention, a PON between a wireless antenna device having a wireless antenna for transmitting and receiving wireless signals to and from a wireless communication terminal and a signal processing device for performing transmission and reception processing of signals with the wireless communication terminal via the wireless antenna device Enables high-speed and efficient communication when connecting.

It is the sequence shown about the operation example of the communication system concerning an embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is the block diagram shown about the whole structure of the communication system which concerns on embodiment. It is a block diagram shown about an internal configuration of each device which constitutes a communication system concerning an embodiment, and a flow of data (signal).

(A) Main Embodiment Hereinafter, one embodiment of a master station communication device, an optical communication network system, and a communication system according to the present invention will be described in detail with reference to the drawings.

(A-1) Configuration of Embodiment FIG. 2 is a block diagram showing the overall configuration of the communication system 1 according to the embodiment.

  FIG. 3 is an explanatory diagram (block diagram) showing the internal configuration of each device constituting the communication system 1 and the flow of packets.

  The communication system 1 is a communication system in the form of C-RAN which connects a UE 30 as a wireless communication terminal owned by a user to the core side network N.

  The communication system 1 includes a BBU 10 as a signal processing device disposed in a central office of a telephone station and RRHs 20 (20-1, 20-2, 20-3) as three antenna devices connected under the BBU 10. And. Then, in the communication system 1, each RRH 20 configures one cell C, and is connected to the UE 20 in the cell C. In this embodiment, as shown in FIG. 2, RRHs 20-1, 20-2 and 20-3 constitute cells C-1, C-2 and C-3, respectively. In this embodiment, the number (the number of cells) of the RRHs 20 connected under the BBU 10 is not limited. Further, the BBU 10 is connected to the core side network N as an upper side network.

  Then, in the communication system 1, wired sections between the BBU 10 and the RRHs 20-1, 20-2, and 20-3 are connected by the PON 2 (optical communication network system). The PON 2 has an OLT 40 (master station communication device) connected to the subordinate (downstream side) of the BBU 10 in the central office of the telephone station, and an ONU 50 (child station communication device) connected to each RRH 20. In the PON 2, the optical fiber 60 connected to the OLT 40 is branched by the splitter 50 and connected to the ONUs 50-1, 50-2, and 50-3, respectively. In this embodiment, as shown in FIG. 2, ONUs 50-1, 50-2, 50-3 are connected to the RRHs 20-1, 20-2, 20-3, respectively. That is, each ONU 50 is connected to the upstream side of each RRH 20 at the same location as the corresponding RRH 20 (for example, on the roof of an apartment, on a telephone pole, etc.).

  As the interface of the OLT 40 and the ONU 50 constituting the PON 2, various PON and interfaces (for example, an interface defined by IEEE 802.3ah) of GE-PON (Gigabit Ethernet (registered trademark) -Passive Optical Network) should be applied. Can.

  That is, in the communication system 1, as shown in FIG. 2, the BBU 10, the OLT 40, the ONU 50, the RRH 20, and the UE 30 are connected in order from the upstream side.

  In this embodiment, as shown in FIG. 3, it is assumed that the UE 30 has a UE radio communication processing unit 31 for performing radio communication with the RRH 20, and a UE application 32. UE30 is a mobile communication terminal which users, such as a smart phone and a mobile router, possess, for example. In addition, various radio | wireless communication terminals can be applied as UE30, and in this embodiment, in order to simplify description, it demonstrates as what is a structure shown in FIG. The UE 30 connects to a core-side network (for example, a network such as the Internet) via the RRH 20 and the BBU 10. The UE application 32 is application software that functions by communicating with other communication devices or servers connected to the core side network N (or another network via the core side network N).

  Next, the internal configuration of the BBU 10 will be described using FIG. As shown in FIG. 3, the BBU 10 of this embodiment includes an uplink packet configuration function 11, a downlink radio signal information configuration function 12, a statistical information holding function 13, a required RB reception function 14, an uplink required RB amount prediction function 15, and RB allocation. It has a scheduling function 16. Note that, in FIG. 3, the configuration of functions (for example, a handover control function related to the UE 30 and the like) that are not directly related to data transmission processing in the section of the PON 2 in the functions of the BBU 10 is omitted.

  The upstream packet configuration function 11 processes an upstream signal received from the RRH 20 (UE 30) from the RRH 20 (UE 30) via the PON 2 and generates and transmits an upstream packet to be transmitted to the upstream side (core side network N) (Transmit to the core side network N). When transmitting the packet to the core side network N, the upstream packet configuration function 11 supplies a copy of the packet to the statistical information holding function 13 and the request RB reception function 14. The upstream packet configuration function 11 supplies the control signal transmitted to the own device to the statistical information holding function 13 and the request RB reception function 14 without transmitting it to the core side network N.

  The downlink radio signal information configuration function 12 processes the downlink packet received from the upstream side (core side network N) and transmits the data configuration of the radio signal to be transmitted to the UE 30 (RRH 20) (for example, encoded for wireless communication) Data configuration of the finished radio signal) and send it to the downstream side (OLT 40). That is, the downlink radio signal information configuration function 12 performs processing of transmitting the generated data (information) of the downlink radio signal to the RRH 20 (UE 30) via the PON 2.

  The statistical information holding function 13 calculates and holds an analysis (for example, transition of a band used for each RRH 20, etc.) of the supplied uplink packet.

  The request RB reception function 14 has a function of receiving a request for a resource block (hereinafter also referred to as “RB”) from each RRH 20 (each UE 30). An RB is a unit for allocating a radio band as a resource. The BBU 10 receives an uplink RB request from the UE 30 (hereinafter, referred to as “uplink RB request”), and performs a process of allocating an RB (uplink radio band) to the UE 30 according to the uplink RB request. That is, each UE 30 needs to obtain a notification (hereinafter referred to as “uplink RB notification”) that permits transmission of a predetermined amount of data (uplink RB) from the BBU 10 when performing uplink data transmission. . When the uplink packet configuration function 11 supplies an uplink packet (data), the request RB reception function 14 analyzes the uplink packet and extracts an uplink RB request.

  The uplink necessary RB amount prediction function 15 is requested next from each UE 30 based on, for example, the statistical information held by the statistical information holding function 13 and the history of the uplink RB request accepted by the request RB accepting function 14. Processing to predict the uplink RB amount. Since various prediction algorithms can be applied to the prediction processing by the uplink necessary RB amount prediction function 15, detailed description will be omitted.

  The RB allocation scheduling function 16 performs scheduling for allocating uplink RBs based on the prediction performed by the uplink necessary RB amount prediction function 15.

  Then, based on the result of the scheduling performed by the RB allocation scheduling function 16, the downlink radio signal information configuration function 12 generates an uplink RB notification for allocating uplink RBs to each UE 30 (uplink RB notification Generate a signal and send it.

  Next, the internal configuration of the OLT 40 will be described.

  The OLT 40 has a packet processing unit 41 as a data transmission / reception processing unit, a packet information copying function 42, an uplink RB information extraction function 43, and a dynamic band allocation calculation function unit 44.

  The packet processing unit 41 processes the downstream packet supplied from the BBU 10 (converts it into a packet on the PON 2 having any ONU 5 as a destination), and sends the packet onto the PON 2. Also, the packet processing unit 41 processes (converts the packet received from any of the ONUs 50 into a packet that can be transmitted to the BBU 10) and transmits the packet to the BBU 10.

  The packet processing unit 41 includes, for example, a processing configuration related to dynamic band allocation (uplink RB information extraction function 43 and dynamic band allocation calculation function unit) among packet processing configurations on the GE-PON defined in IEEE 802.3ah. 44) can be realized by the processing configuration excluding the above.

  The packet information copy function 42 copies the packet in the downlink direction supplied from the BBU 10 to the packet processing unit 41 and supplies the packet to the uplink RB information extraction function 43.

  The uplink RB information extraction function 43 performs processing for extracting uplink RB notification from the packet (a packet in the downlink direction from the BBU 10) supplied from the packet information copy function 42. Then, the uplink RB information extraction function 43 supplies the extracted uplink RB notification to the dynamic band allocation calculation function unit 44.

  The dynamic band allocation calculation function unit 44 allocates a band for data transmission in the uplink direction to each ONU 50 on the PON 2 and controls the packet processing unit 41 so that the upstream signal from each ONU 50 is equal to or less than the allocated band. Do the process. Specifically, the dynamic band allocation calculation function unit 44 transmits the transmission timing of the GRANT signal (GATE signal) that the packet processing unit 41 transmits to each ONU 50 so that the upstream signal from each ONU 50 is equal to or less than the allocated band. And control the content (the amount of upstream signal data permitted by each GRANT signal). The specific method of dynamic band allocation performed by the dynamic band allocation calculation function unit 44 is not limited. For example, a DBA (Dynamic Bandwidth Allocation) algorithm on various GE-PONs is partially used. You may do so.

  Then, the dynamic band allocation calculation function unit 44 considers each ONU 50 in consideration of the contents of the REPORT signal received from each ONU 50 by the packet processing unit 41 and the contents of the uplink RB notification supplied from the uplink RB information extraction function 43. Perform processing to assign to. Details of the process of the dynamic band allocation calculation function unit 44 performing the dynamic band allocation in consideration of the contents of the uplink RB notification will be described later.

  As described above, in the OLT 40, the bandwidth control processing means is realized by the upstream RB information extraction function 43 and the dynamic bandwidth allocation calculation function unit 44.

(A-2) Operation of Embodiment Next, the operation of the communication system 1 of this embodiment having the configuration as described above will be described.

  FIG. 1 is a sequence diagram showing an example of the operation of the communication system 1.

  FIG. 1 illustrates an example in which the UE 30 connected to the cell C-1 configured by the RRH 20-1 performs uplink data transmission.

  In FIG. 1, in the initial state, an initial connection between the OLT 40 and the ONU 50-1 is described as being established. Further, in FIG. 1, in the initial state, an initial connection between the BBU 10 and the RRH 20-1 will be described as being established.

  In the initial state as described above, it is assumed that the UE 30 becomes in a state capable of wireless communication with the RRH 20-1 and participates in the cell C-1, and a connection between the UE 30 and the BBU 10 is established (S101). Processes similar to those of various C-RANs can be applied to the connection sequence between the UE 30 and the BBU 10 at this time, and thus detailed descriptions thereof will be omitted.

  Next, the uplink necessary RB amount prediction function 15 of the BBU 10 calculates, for the UE 30, an uplink RB expected to be necessary. Then, in the BBU 10, the RB allocation scheduling function 16 performs adjustment and scheduling (determination of transmission time) for the RB predicted by the uplink necessary RB amount prediction function 15. At this time, the RB allocation scheduling function 16 determines the final RB amount for the UE 30 in consideration of uplink RBs predicted for other terminals. Hereinafter, the amount of uplink RBs finally determined by the RB allocation scheduling function 16 to the UE 30 is represented as “A”. As described above, the RB allocation scheduling function 16 determines the amount of RBs to be finally allocated and the time (data transmission timing of the amount concerned) based on the RBs predicted to be necessary by the uplink necessary RB amount prediction function 15. . Then, the uplink RB notification in which the RB amount A determined by the RB allocation scheduling function 16 and the time are set is configured as a downlink signal by the downlink radio signal information configuration function 12 and sent to the UE 30 (S102).

  Then, the uplink RB notification (amount A) addressed to the UE 30 reaches the UE wireless communication processing unit 31 of the UE 30 via the OLT 40, the ONU 50-1, and the RRH 20-1 (S103 to S105).

  At this time, in the OLT 40, the uplink RB notification (amount A) addressed to the UE 30 is copied by the packet processing unit 41 and supplied to the uplink RB information extraction function 43. Then, in the uplink RB information extraction function 43, the uplink RB notification (amount A) is extracted and transferred to the dynamic band allocation calculation function unit 44. Then, the dynamic band allocation calculation function unit 44 allocates, to the UE 30 (ONU 50-1), an uplink band (band on the PON 2) corresponding to the amount A (S106). At this time, the dynamic band allocation calculation function unit 44 performs processing using a conversion formula that converts the amount of RB designated by the uplink RB notification into a unit on PON 2 (a unit representing a band (data amount) on PON 2). May be performed. For example, the dynamic band allocation calculation function unit 44 may convert into a unit on the PON 2 by multiplying the amount (value) of RBs set in the uplink RB notification by a predetermined coefficient. Also, at this time, the dynamic band allocation calculation function unit 44 takes into consideration the time set in the uplink RB notification and actually transfers data actually sent from the UE 30 to the ONU 50-1 (hereinafter referred to as “expected transfer” The timing (referred to as “timing”) may be predicted and reflected in the GRANT signal. For example, the dynamic band allocation calculation function unit 44 predicts a time (the time after a predetermined time has elapsed from the time set in the uplink RB notification) obtained by adding a delay of the predetermined time to the time set in the uplink RB notification It may be set as timing.

  Next, the packet processing unit 41 causes the GRANT signal (control signal) to permit data transmission of the band (data amount) allocated by the dynamic band allocation calculation function unit 44 to the estimated transfer timing as the ONU 50-1. Send to address (S107).

  On the other hand, in the UE application 32 of the UE 30, it is assumed that an event of performing uplink data transmission corresponding to the RB of quantity B has occurred. Then, the UE application 32 supplies data corresponding to the amount B to the UE wireless communication processing unit 31 (S108).

  At this time, since the UE radio communication processing unit 31 has already acquired the uplink RB notification of the amount A, if the amount B <the amount A, all data transmission can be performed by one transmission. However, in the following description, it is assumed that the amount B> the amount A. In this case, the UE radio communication processing unit 31 transmits data to the BBU 10 by the amount A and determines to transmit an uplink RB request for requesting the RB of the amount B-A which is a shortage. Become. In this case, in the UE wireless communication processing unit 31, traffic data corresponding to the amount B-A remains.

  Therefore, here, when the UE 30 (UE radio communication processing unit 31) performs data transmission of the amount A to the BBU 10 at the time designated by the uplink RB notification, the uplink RB request for the amount B-A is performed Is added (S109). The uplink RB request (amount B-A) is treated as additional information of data transmission of amount A, and the following description will be made assuming that transmission is possible within the range of data transmission of amount A.

  Then, the data (amount A) sent from the UE 30 reaches the BBU 10 via the RRH 20-1, the ONU 50-1, and the OLT 40 (S110 to S112).

  At this time, the ONU 50-1 has already obtained the permission (GRANT) of data transmission corresponding to the RB of the amount A from the OLT 40 in the above-described step S107, and thus separately transmits a permission (REPORT signal) to the OLT 40 There is no need to do Therefore, at this time, when the ONU 50-1 acquires the data (amount A) sent from the UE 30, the ONU 50-1 can transmit the data to the OLT 40 without delay.

  Then, in the BBU 10, a predetermined process (for example, an upstream packet generation process) is performed by the upstream packet configuration function 11 on the data of the amount A supplied from the UE 30. At this time, in the request RB reception function 14, the uplink RB request from the UE 30 is extracted and supplied to the uplink required RB amount prediction function 15. Then, the amount of uplink RBs and its time taking into consideration the uplink RB request (the shortage amount B-A) are determined by the uplink required RB amount prediction function 15 and the RB allocation scheduling function 16. At this time, the amount of uplink RBs finally determined by the RB allocation scheduling function 16 is represented as “C”. Then, the uplink RB notification in which the RB amount C determined by the RB allocation scheduling function 16 and the time are set is configured as a downlink signal by the downlink radio signal information configuration function 12 and sent to the UE 30 (S113).

  Then, the uplink RB notification (amount C) addressed to the UE 30 reaches the UE wireless communication processing unit 31 of the UE 30 via the OLT 40, the ONU 50-1, and the RRH 20-1 (S114 to S116).

  At this time, the dynamic band allocation calculation function unit 44 of the OLT 40 allocates the uplink band corresponding to the uplink RB notification (amount C) to the UE 30 as in the above-described step S106 (S117).

  Next, the packet processing unit 41 causes the GRANT signal (control signal) to permit data transmission of the band (data amount) allocated by the dynamic band allocation calculation function unit 44 to the estimated transfer timing as the ONU 50-1. It transmits to address (S118).

  Then, the UE 30 (UE radio communication processing unit 31) transmits data of the amount B-A to the BBU 10 at the time designated by the uplink RB notification (S119). Here, it is assumed that C> (B−A), and the shortage of the amount of RBs does not occur in the UE radio communication processing unit 31.

  Then, the data (quantity B-A) sent from the UE 30 reaches the BBU 10 via the RRH 20-1, the ONU 50-1, and the OLT 40 (S120 to S122).

  At this time, the ONU 50-1 has already obtained the data transmission permission (GRANT) corresponding to the RB of the amount C from the OLT 40 in the above-described step S118, so the data (amount B-A) sent from the UE 30 Once acquired, the data can be transmitted to the OLT 40 without delay.

(A-3) Effects of the Embodiment According to this embodiment, the following effects can be achieved.

  In the communication system 1, the OLT 40 acquires and analyzes the content of the uplink RB notification transmitted from the BBU 10 to the UE 30, and based on the analysis result, preallocates a band (data amount) required for the UE 30. Is transmitted to the corresponding ONU 50 (the ONU 50 related to the RRH 20 to which the UE 30 is connected) (for example, see steps S106 and S107 in FIG. 1). Thereby, in the ONU 50, even when data transmission in the uplink direction is performed from the UE 30 according to the uplink RB notification, the data transmission permission (GRANT) acquired in advance from the OLT 40 is used, and the data is transmitted without delay. It becomes possible to transmit to the OLT 40 (see, for example, step S111 in FIG. 1).

  Here, it is assumed that the OLT 40 does not perform the process of transmitting the GRANT signal in advance based on the uplink RB notification. In this case, after acquiring the data sent from the UE 30, the ONU 50 transmits a REPORT signal for requesting data transmission in the uplink direction (requests a band (resource) in the uplink direction) to the OLT 40, and the REPORT signal from the OLT 40 Data transmission can be started for the first time after obtaining the GRANT signal (permission of uplink data transmission) corresponding to. On the other hand, since the ONU 50 of the communication system 1 of this embodiment may transfer data from the UE 30 according to the GRANT signal acquired in advance, data transfer processing in the upstream direction (with extremely high efficiency) is not delayed. It can be carried out.

  In addition, in the communication system 1 of this embodiment, only the necessary data is transferred when necessary, instead of periodically communicating between the OLT 40 and the ONU 50. As a result, the sleep time of the ONU 50 is extended. Power-saving operation. For example, when packets are transmitted and received at a fixed cycle between the OLT 40 and each ONU 50, it is difficult to take a long sleep time for the ONU 50 when providing a transmission line of a fixed band such as a dedicated line substantially. However, as in this embodiment, by securing the upstream band based on the upstream RB notification, the ONU 50 can be operated efficiently and a longer sleep time can be secured.

  Furthermore, in the communication system 1 of this embodiment, only the OLT 40 duplicates and analyzes the downstream signal from the BBU 10, and secures the upstream signal band with the ONU 50 ahead of the upstream signal from the UE 30. For BBU 10 and RRH 20, devices compatible with conventional C-RAN can be applied as they are. In other words, as viewed from the BBU 10 and the RRH 20, the section of the PON 2 can be viewed as a mere transmission path, so that it can be transparently communicated without being aware of its existence. Therefore, for example, even when BBU 10 and RRH 20 exist as existing facilities, only by inserting PON 2 into the wired section later (or replacing the PON of the existing wired section with PON 2 of this embodiment), the existing facility can be obtained. It becomes possible to exhibit each effect mentioned above.

(B) Other Embodiments The present invention is not limited to the above embodiments, and may include modified embodiments as exemplified below.

  (B-1) In the above embodiment, the configuration is shown in which the PON 2 is transmitted between the BBU 10 and the RRH 20 based on the C-RAN, but the PON 2 is not limited to the C-RAN, and various wireless base stations ( The present invention can be applied to data transmission in a wired section of a base station separated into an antenna device and a signal processing device.

  DESCRIPTION OF SYMBOLS 1 ... Communication system, 2 ... PON, 10 ... BBU, 11 ... Uplink packet configuration function, 12 ... Downlink radio signal information configuration function, 13 ... Statistical information holding function, 14 ... Request RB reception function, 15 ... Uplink required RB amount forecast Functions 16 RB allocation scheduling function 40 OLT 50 packet processing section 42 packet information copying function 43 upstream RB information extraction function 44 dynamic band allocation calculation function section 50 splitter 60 Optical fiber 50, 50-1, 50-2, 50-3 ... ONU, 20, 20-1, 20-2, 20-3 ... RRH, 30 ... UE, 31 ... UE wireless communication processing unit, 32 ... UE Application, N: core side network, C, C-1, C-2, C-3: cell.

Claims (5)

Optical communication for performing data transmission between a plurality of wireless antenna devices having a wireless antenna for transmitting and receiving wireless signals to and from a wireless communication terminal, and a signal processing device for performing transmission and reception processing of signals with the wireless communication terminal via the wireless antenna device In the master station communication device that configures the network system,
A process of connecting a slave station communication device connected to each of the wireless antenna devices by a star network, processing data supplied from the signal processing device, and sending it as a downlink signal to the slave station communication device; And processing an upstream signal received from each of the slave station communication devices and transmitting the processed signal to the signal processing device, wherein the slave station communication device receives an upstream signal from the slave station communication device. A data transmission / reception processing unit that permits uplink signal transmission to the
The communication control signal to the wireless communication terminal is extracted with reference to the downlink signal processed by the data transmission / reception processing unit, and the uplink signal transmitted from the wireless communication terminal is predicted based on the extracted communication control signal. And controlling the data transmission / reception processing unit based on the result of the prediction, to the slave station communication device corresponding to the wireless antenna device to which the wireless communication terminal is connected, of the upstream signal based on the result of the prediction And a band control processing means for transmitting a transmission permission.   The notification signal of the resource allocation related to the uplink signal transmission to the wireless communication terminal is acquired with reference to the downlink signal processed by the data transmission / reception processing unit, and the wireless communication terminal is acquired based on the acquired resource allocation communication signal. The parent device according to claim 1, wherein the data amount of the uplink signal transmitted from the mobile station is predicted, and the transmission permission of the uplink signal considering the predicted data amount of the uplink signal is transmitted in advance to the slave station communication device. Station communication device.   The notification signal of the resource allocation related to the uplink signal transmission to the wireless communication terminal is acquired with reference to the downlink signal processed by the data transmission / reception processing unit, and the wireless communication terminal is acquired based on the acquired resource allocation communication signal. Data amount and transmission timing of the uplink signal transmitted from the network, and transmission permission of the uplink signal in consideration of the predicted data amount of the uplink signal and transmission timing is transmitted to the slave station communication apparatus in advance. The master station communication apparatus according to claim 1. A star network connects between a plurality of wireless antenna devices having a wireless antenna for transmitting and receiving wireless signals to and from a wireless communication terminal, and a signal processing device for performing transmission / reception processing of signals with the wireless communication terminal via the wireless antenna device. In the optical communication network system,
A slave station communication device connected to each of the wireless antenna devices, and a master station communication device connected to the signal processing device and connected to each slave station communication device by a star network;
An optical communication network system characterized in that the master station communication device according to any one of claims 1 to 3 is applied as the master station communication device.   A wireless communication terminal, a plurality of wireless antenna devices having a wireless antenna for transmitting and receiving wireless signals to and from the wireless communication terminal, and a signal processing device for performing transmission / reception processing of signals with the wireless communication terminal via the wireless antenna device; An optical communication network system according to claim 4 is applied as the optical communication network system in a communication system comprising an optical communication network system in which each of the wireless antenna devices and a master station communication device are connected by a star network. A communication system characterized by having.

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